Plain English Meaning

It means you can't talk to the people who run that airspace by radio while you're flying. If you need to coordinate with them, you have to do it through air traffic control or by phone before you take off.

Full Definition

A notation used on special use airspace charts and tables indicating that the controlling or using agency for that airspace does not provide direct air-to-ground radio communications with pilots operating in or near it. Pilots cannot raise the using agency on a published frequency from the cockpit; coordination must occur through other means, typically the controlling ATC facility or by telephone before flight.

Context Anchor

Seen in chart or information for special use airspace, such as a , , or .